Hot-air furnace



J. A. HAGSTROM HOT AIR FURNACE Filed Aug. 9, 1923 March M, 1924.

John Hucgsbrom INVENTOR 25 per chamber having a secondary chamber arber11 which fits directly over the lower 80 a a Fatented Mar. 11, 192 L dfi afi JOHN A. HAGSTROM, OF Yfill'hl'GSTOWN,v OHIO.

HOT-AIR FURNACE.

Application filed. August 9, 1923. Serial No. 656,472.

To all whom it may concern: Figure 8 is a top plan view of a second Beit known that J OHN A. HAGs'rRoM, a section resting upon the lowersection. citizen of the United States of America, re- Figure 4 is a topplan view of a top secsiding at Youngstown, in the county of Mation ofthe furnace showing the upper coverhoning and State of Ohio, hasinvented cering of the same removed. tain new and useful Improvements inHot- Figure 5 is a detailed view showing curved Air Furnaces, of whichthe following is a and slotted partitions, shown in Figure 3.specification. By referring to Figures 1 and 2 it will be This inventionrelates to what is known seen that I have provided a lower section 1 10to the trade as hot air furnaces. The princiequipped with grates 2 and3. There is also 65 pal object of this invention is to provide aprovided an ash pit 4 underneath the grates furnace reasonably simple inconstruction having clean out doors 5. Centrally located andparticularly eflicient in producing heat within the lower section 1 andbetween the with a minimum amount of fuel. grates 2 and 3 there isprovided a hot air Another object of this invention is to promanifold 6provided with a plurality of vide a furnace having the fire pot dividedopenings 7. These openings 7 are formed by means of a preheated airmanifold. in the ridge portion of the upper part 8 of A still furtherobject is to provide means the hot air manifold 6. It will also be seenfor admitting overhead air at both sides of that there is a fresh airinlet 9 connecting chambers arranged above the fuel line of with therear end of the hot air manifold 63. said furnace. By referring toFigure 3 it will be seen Another object is to provide a secondary that Ihave provided a second section 10. outlet to a chimney or flue for saidfurnace. This section 10 is semi-elliptical in shape A still furtherobject is to provide an upand provided with an interior circular memranged so as to regulate the gases produced section 1. This interiorcircular section 11 by the burning fuel within said furnace in isprovided with curved and slotted partirelation to its final exit to anoutlet leading tions 12 and 13 which are formed in two to a chimney orflue for said furnace. sections for the convenience of inserting or 0 Inorder that the present invention may removing the same (see Fig. 5).These be more readily comprehended, I have discurved and slottedpartitions allow waste closed one embodiment of the same in the gasesand smoke to pass into chambers 1 accompanying drawings, though it is tobe and 15 formed at the ends of the second understood that thesedrawings are merely section 10. It will also be seen that these 35illustrative and that the contemplated strucchambers 1-1 and 15 areprovided with fresh ture is susceptible of a wide range of variaairinlets 16 and 17 respectively. By again tion and modification withoutdeparting referring to Figure 3 it will be seen that from the spirit ofthe invention or sacrific- I have provided a secondary exit 18 leadinging any of the salient features or underlying to an ordinary chimney orflue. This sec- 0 principles thereof. ondary exit is provided with adamper 19 Ordinary furnaces known to the trade carrying an operating arm20. This damper make no special provision for consuming the 19 isnormally closed but in order to utilize smoke that usually finds its wayup the the same an ordinary cord or chain is at chimney. With theconstruction which is tached to point 21 on the operating arm 20.

5 about to be set forth. it is believed that the The other end of thiscord or chain to be incompleted combustion of fuels which ordiattachedto feed doors 22 and 23 so that narily go up the chimney in the form ofwhen either or both of the feed doors 22 and combustible gases, carbonand smoke will be 23 are opened the operating arm 20 will be utilized inproviding heat and thus saving drawn upwardly to a position shown inFig- 50 fuel. are 3 thereby opening the damper 19. The

In the drawings: object of this secondary exit 18 is to provide Figure 1is a front elevation of the furefiicient escape for smoke or gasesdirectly nace. to the flue or chimney when the furnace Figure 2 is a topplan view of a lower secis being fired, it being understood that when 55tion of the furnace. the feed doors 22 and 23 are closed the damper 19automatically closes, due to the gravity pull on the operating arm 20which is in a horizontal position when the damper 19 is open.

By referring to Figure 4 it will be seen that I have provided a topsection 24 which is similar in shape to that of the second section 10.

By referring to Figures 1 and 1, it will be seen that I have providedupper outlets 23 and 26 leading into chambers 27 and 28 formed in thetop section 2 1. It will be seen that I have provided a circular capmember 29 fitting securely over the interior circular member 11. Thechambers 27 and 28 are separated by means of a partition 30 and arectangular outlet chamber 31 positioned directly above the partition 30and secured to the covering 32 of the top section By referring to Figure4t it will be seen that this rectangular outlet chamber 31 is providedwith-an exit 33 leading to an ordinary flue or chimney. A bottom portion3 1 of the rectangular outlet chamber 31 is provided with openings 35and36. These openings 35 and 36 being diagonally disposed into bottomportion 34: in such a manner that there is provided an opening on eachside of the partition 30. It will also be seen that I haveprovidedashut-off member 37 provided with a slide 38 which closes the opening 35when the shut-ofi member 37 has been pushed in as shown in Figure 4. Itwill also be seen that when the shutoff member 37 is pulled outwardlythe slide 38 closes the opening 36 and opens the open ing 35.

The operation of the device is as follows:

The fire may be'startcd over either grate 2 or 3 as desired. If the lireis started over the grate 2 the shut-off member 37 should be pulled outin order to close the opening 36 and open the opening 35. The firenowmay be started over the grate 3 when the shut-off member 37 should bepushed in closing the opening 35 and opening the opening 36. The furnaceshould now be fired at intervals of such time as found necessar toproduce the desired heat, one grate being fired at a time and in orderto secure maximum combustion of the fuel the openings 35 and 36 shouldbe closed or opened in the manner described starting the fire. Inoperating the furnace in the manner above described it will be seen thatif fuel'is placed upon the fire over the grate 3 the gases and smokewill be forced to take azdirection passing over-the top of the hotessence air manifold 6 where preheated air is mingled with this smokeand gas being directed over the fire on the grate 2 where a maximumamount of the unburnt qualities of the fuel will be consumed. The refuseconsisting of incombustible gases etc. now passes through the curved andslotted partition 13 into the chamber 15, from which it passes into thechamber 28 and then through to opening 36 and on out to an exit 33leading to an ordinary chimney or flue. It will be understood that byalternating the feeding over the grates 2 and 3 and manipulating thefurnace as above described the passage of the combustible gases and thenon-combustible gases will take alternating In a device of the classdescribed the bottom section of a furnace carrying two sets of grates,an ash pit formed underneath said grates, a preheated hot air manifoldpositioned between said grates, a fresh air inlet leading into one endof said preheated hot air manifold, a ridge portion formed on the upperportion of said preheated hot air manifold, a plurality of openingsdistributed in the above mentioned ridge, a second section positionedabove said grates and connecting parts, an interior circular memberwithin said second section, curved. gratings secured to the sides ofsaid interior circular section, a chamber communicating with saidgratings, fresh air inlets leading into said chambers, a secondaryoutlet leading from the interior circular member, a damper functioningin-said secondary outlet, a top section positioned above said secondsection, a circular cap member fitting securely over said interiorcircular member, two chambers formed in a top section, a verticalpartition separating said chambers, a rectangular out let chamber formeddirectly above said partition, two openings formed in the bottom of saidrectangular outlet circular, one opening on one side of said partitionand another opening diagonally disposed and positioned on the other sideof said partition, a slide functioning with said opening for the purposeof regulating the direction of non-combustible gases etc. escaping to anoutlet leading to an ordinarychimney,substantially as described for thepurpose set forth.

In testimony whereof I affix my signature.

JOHN A. HAGSTROM. Vitnesses:

O. A. HARP AN, W. B. HARPMAN.

